package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 创建shoppingCart对象接收购物车数据
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        // 只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        // 判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if(shoppingCartList!= null && shoppingCartList.size() ==1){
            // 如果存在，就更新数量，数量加1
             shoppingCart = shoppingCartList.get(0); // 获取到这个对象
             shoppingCart.setNumber(shoppingCart.getNumber()+1);
             shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            // 如果不存在，就插入数据
            // 判断添加的是套餐还是菜品
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                // 如果是菜品，则将数据添加入购物车表中
                Dish dish = dishMapper.getByID(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                // 如果是套餐
                Setmeal setMeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setMeal.getName());
                shoppingCart.setImage(setMeal.getImage());
                shoppingCart.setAmount(setMeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /***
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {

        return shoppingCartMapper.list(ShoppingCart.
                builder().
                userId(BaseContext.getCurrentId()).
                build());
    }

    /**
     * 清空购物车
     */
    @Override
    public void deleteShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    @Override
    public void deleteShoppingCartOne(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
